Updt Sequencer errormsg on try_contr on 200ok code

powersoftau.go

@@ -138,7 +138,7 @@ func newEmptySRS(nG1, nG2 int) *SRS {
 }
 
 func tau(round int, randomness []byte) *toxicWaste {
-	val := blake2b.Sum256(randomness)
+	val := blake2b.Sum256(append(randomness, byte(round)))
 	tau := new(big.Int).Mod(
 		new(big.Int).SetBytes(val[:]),
 		g2.Q())

powersoftau_test.go

@@ -57,6 +57,11 @@ func TestBatchContribution(t *testing.T) {
 		bc.Contribute([]byte("1111111111111111111111111111111111111111111111111111111111111111"))
 	c.Assert(err, qt.IsNil)
 
+	c.Assert(len(nb.Contributions), qt.Equals, 4)
+	c.Assert(g2.Equal(nb.Contributions[0].PotPubKey, nb.Contributions[1].PotPubKey), qt.IsFalse)
+	c.Assert(g2.Equal(nb.Contributions[0].PotPubKey, nb.Contributions[2].PotPubKey), qt.IsFalse)
+	c.Assert(g2.Equal(nb.Contributions[0].PotPubKey, nb.Contributions[3].PotPubKey), qt.IsFalse)
+
 	_, err = json.Marshal(nb)
 	c.Assert(err, qt.IsNil)
 }